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septl 28 ,1926. 1,601,344

I E. R. BURTNETT INTERNAL coMBUsTIoN ENGINE Filed Augustl 13. 1923 2 sheets-sheet. 1

Sept. 28 1926. 1,601,344

E. R. BURTNETT INTERNAL COMBUSTION ENGINE Filed August 13v )923 2 Sheets-Sheet 2 Patented Sept. 28, 1926.

Unirse sra'rns FORMIA, A VOLUNTARY TRUST.

lPartnr OFFICE.

EVEREQT R. BURTE'ETCL OF LOS ANGELES, CALIFORNA, ASSIGNOR, BY DLRECT AND l IYIESNE ASSGNMENTS, TO THE ATOIEC OTVE VALVES CO., OF LOS ANGELES, CALI- IUTERNAL-COMBUSTION ENGINE.

Application fiIed August 13, 1923. Serial No. 657,239.

My invention relates` to an air cooled, two stroke cycle internal combustion engine and the principal objects of my invention are, to provide a two stroke cycle internal combustion engine having but two cylinders, two pistons and two cranks on the crank shaft, said parts being arranged so as to develope a power impulse, each 180 Vdegrees of the crank shaft rotation, said engine having a valved port adapted to release the hot burnt gases or products of combustion in front of the engine structure, directly in the path of an air cooling draft; to provide an engine having a charge stratification and ignition chamber; to provide an engine in which the iames of combustion will be prevented from reaching the piston by the constant retention of the full cylinder displacement of spent products of combustion and in which engine additional piston cooling is effected to the combustion chamber piston by the pumping of the gaseous fuel mixture into an annular chamber that surrounds the lower structure of said piston.

A further object of my invention is the provision of an engine of extreme simplicity and rugged structure with parts constructed, arranged and timed for increased operating efficiency, cooling efficiency, thermal efficiency, and of minimum cost of production, operation and maintenance.

Vith the foregoing and other objects in view, my invention consists in the combination a two diameter cylinder in which a two diameter piston is arranged for operation, thereby providing two piston chambers, one of'cylindrical form between the center cylinder head and the inner piston head, the second, an annular formed chamber between the first and second diameters of the cylinder and piston; the inner or cy-l lindrical chamber having a side pocket to the compression clearance, said side pocket having two ports, valvular means for said ports, an ignition device in the pocket; one port in the side pocket being for the release of the spent products of combustion, the second port to said pocket being for the admission of precompressed gaseous fuel mixture as a supercharge to the chamber of which the pocket is a part; a pocket to the annular chamber and a port to said pocket,

valvular means for said port, the latter being for the admission of a gaseous mixture to the said annular chamber as a displacement to the piston stroke; a crank shaft having one crank throw for each two diameter cylinder, a connection between the said crank and the two diameter pistons, valve actuating means directly applied to the crank shaft, for the operation of the two Yalves in the pocket of the first chamber, and for operating the valve in the pocket of the annular or second chamber, the arrangement of the cylinder and the lirst chamber pocket so that the port and the valve functioning for the release of the hot spent products of combustion, are located of the engine, on a line parallel with the axis of the crank shaft; a pair of two diameter, two chamber cylinders, disposed in V-arrangement, and radial relative to the axis of the crank shaft, the cylinders in structure being identical and each located so that the port and valve in the pocket that controls the release of the spent hot products of combustion, are formed on a line parallel with the axis of the crank shaft and said engine having conduits arranged between the annular chamber of each cylinder and the valved port of the pocket of the cylinder head chamber adapted for the admission of precompressed gaseous mixture as a supercharge to the residual volume content of the cylindrical chamber and pocket of the other cylinder.

Fig. l is a vertical section taken transversely of the engine and through the centers of the cylinders thereof.

Fig. 2 is a vertical longitudinal section taken through the center of one of the engine cylinders and through the center of the crank case.

Referring by numerals to the accompanying drawings, 10 `designates a suitably formed crank case, having bearings 11, preferably of the ball or roller type, for a crank shaft 12, which latter is provided with two cranks 13 and 14 that are disposed less than 180 degrees apart.

Positioned on top of the crank case in V- arrangement and on opposite sides of the vertical center line of the engine are cylinders l5 and 16, the same being offset .points 1&8() degreesV apart in the throw or circular patlroft travel of said cranks. ller instance, if the axes of the cylinders are disposed G degrees aparathen the cranks are arranged 120 degrees apart or 60 degrees less than 180 degrees.

Thel cylinders l5 and 1S are practically identical in size, lorni and construction and each having; a two diameter bore, with the bore or chamber 17 of smaller diameter in the upper portion ot the cylinder block and the bore` or chamber 18 of larger diameter ini the Alower portion of said bloei-.

Arranged for reciprocatortT movement with each cylinder is a twoy di ter piston 19, the main body portion of Y ch, or the portion having. the smaller diam( ser, operates Within the chamber 1i and the lower portion 20 ort said piston or they portion having the larger diameter eing arr ged lor operationI Within the larger chamber 18 in the cylinder.

A connecting rod 21 connects the piston in cylinder 15, Withcranl 13 and a` similar rod 'con'nects the piston` in cylinder 16 with crank 14A..

Formed integral with or xed to the rear portion of each cylinder 15 and 1S', is a tubular litting 23, the inner end` or which communicateswith the upper portion ot the chamber 18 ot larger diameter Within the cylinder and iiorined Within said fitting in terniediate its ends is a seat upon which normally rests a spring held valve 24.

rl-he lower end of the depending stein or this valve .is engaged by the upper end of a plunger 25 that is arrar ged for sliding moy'cn'ient ini a suitable bearing; LGj in the upper portion of the cranlt case 10 andthe lower end orsaio. plunger bears ony the periphery of a cam 27, that is secured to crankshaft 12;

The outer end of the duct through fitting 23' is connected to a suitable source ot gaseousfuel` supply, preferably a carburetor.

Each cylinder is formed at :its upper end with a short forwardly projecting housing 28 in the outer portion oi- Whichf 's norined an ignition` chamber 29 and the latter being connected to the' upper endy of. chamber 17 by a short goose-neelrwduet 30.

Leading downwardly from the ignition chamber 29 is an exhaust duct 31 and normally resting upon a seat that is lornied between said chamber 29 and duct 31 is a spring held exhaust Valrel.

The lower end ol the depending stein ol this exhaust valve engages the upper ond ol' apluuger and the lower end olA the laitier bears on the periphery ot a cani ill, that is secured to the rank shalt.

Seated in the fall ot housing that sur rounds the ignition chamber 2S) is a spark plug 35, the inner ends oi' the electrodes thereof terminating Within said chamber.

Seated in the upper portion ol housingl illu above the ignition chamber ill) is ai valve c ge having` at its lower end, :t seat for a spring held gaseous fuel inlet Valve 2li'.

Bearing on the upper end ot the stein oil? this valve is the inner end of a rocher arm S8, that is Yliulcruired on af luacltet and bearing against the under side oi the outer end oilf this arm is the upper endy ot a push rody l The lower end olf this push rod hears on the upper end ci? a plunger il that is arranged to slide through a suitable bearing -l-Z and the lower end of said plunglger bearing on a cani i3 that is secured to` the crank shaft.

inasmuch as there are two orlinders in my iniproved engine, it nece sarily 'follows that there are two compressed gaseous fuel transiter valves 31T and their actuating cams 413, two exhaust vvalves 32 and their actua ting cams and two gaseouf-i l'ucl inlet valves a andi their actuating` cams 2T.

ylhe upper portions oi the cylinders4 l5 and 16 and their extensions 28 are Alori-.ned with externally arranged heat radiating tins 4A and arranged for operation on a bracket i5 that projects from the trout e d ot the crank case, a Vlian or lans 1li? that muy he driven in any suitable manner and which are adapted to dir-ect blasts ol cooling air rearwardly over the housings :2&3 and upper portions oit the cylinders.

Formed through the wall oi"` cui. cylinder at the upi er end oit the larger c hrunher ll therein is a port i7 and leading therefrom to an inletl port riti that is formed in the valve cage 3G, .in the upper end oi the other cylinder .is a compressed gaseous liu-el traut-- fer duct 1li).

Thus, gaseous fuel that is compressed Within chamber 18 in cylinder .l5 is transferred to the ignition and combustion chamn bers at the upper end oli cylinder li and vice versa.`

rlhe operation.` ot my inuarored engine is as followsi At the point ot highest eoinprcisiou. or as the piston passes high center at the inner end ot its stroke, a sourir is produced be,- tween the terminals of the electrodos or the corresponding spark plug, thus irguiting the charge ci compressed gaseous vfuel within the corresponding ignition chamber 29 and the force of the expansion following combustion will act against the head of the corresponding piston to drive same downward on its power stroke.

As the piston approaches and passes low center, the corresponding cam 34 actuates its plunger to` lift exhaust valve 32 from its set, thereby bringing about an instantaneons reduction in pressure and permitting a substantial portion of the products of conibustion to exhaust past the open valve 32 and out through duct 3l.

rThe exhaust valve then closes and practically at the saine instant the fuel transfer inlet valve 37 is opened a result of the corresponding cam 43, actuating plunger 41, push rod 40 and rocker arm S8 and as said valve. is opened, a charge of precompressed gaseous fuel is admit-ted to ignition chamber 29, duct 30 and to the upper portion of the piston sweep chamber l? above lthe stratum of residual products of combustion therein.

It will be understood that this admitted charge of gaseous fuel was compressed in the compression chamber I8 of the other or opposite cylinder, during the upward or inward movement of the piston therein, particularly the lower portion Q0 of larger diameter and that the compressed fuel passes through the corresponding transfer duct 49, into and through the corresponding inlet port 48.

It will also be understood that owing to the arrangement of the cranks 13 and 14, the pistons travel in opposite directions, so that when :the piston cylinder 16 is at the lower or outer end of its stroke, the piston in cylinder l5 is at the upper or inner end of its stroke.

After the transfer inlet valve 8T closes, the continued upward movement of the piston will compress the admitted charge of gaseous fuel within the chamber Q9 and the volume of residual products of combustion will be compressed in a stratum in chamber 30 and in that portion of the chamber 17, above the piston.

Thus, the lcharge of gaseous fuel and residual products of combustion are compressed in stratified relation and the. expansive forces of the fuel charge when ignited and burned, act through the compressed non-combustible volume against the head of the piston to drive same downward on its power stroke.

Ubviously the disposition of a stratum of residual products of combustion directly above the piston, tends to counteract the ein cessively high temperatures that would otherwise pass from the burning charge to the head of the piston and this cooling effect is enhanced by the flow of relatively cool products of combustion into the annular compression chamber 19 around the lower portion of the piston.

The upper portions of the cylinders and the housings 28 are cooled bv the blasts of are directed against the fins 44 and this action is enhanced by the flow of comparatively cool compressed products of combustion through the inlet valve cage, into the chamber 29 and against the adjacent exhaust valve.

Thus it will be seen that I have provide-d a relativelyY simple and practical two stroke cycle, two cylinder internal combustion engine that may be economically employed whellever rotary motion and power are desiret.

It will be understood that minor changes in the size, form and construction of the various p arts of my improved engine may he made and substituted for those herein shown without departing from the spirit of my invention, the scope of which is set forth `in the appended claims.

I claim as my invention:

l. In an internal combustion engine, a pair of cylinders, each having` a two diameter bore, the head portion of the smaller bore of each cylinder having a lateral pocket, a pair of ports in each pocket, a valve controlled gaseous fuel inlet port communicating with the. upper portion of the larger bore in each cylinder mechanically actuated U5 valves normally closing` all of said ports, and means including cams mounted directly on the crank shaft of the engine for unseating all of said valves.

2. In an internal combustion engine, a pair of cylinders, each having a two diame ter bore, the head portion of the smaller bore of each cylinder having a lateral pocket, a pair of ports in each pocket, a gaseous fuel inlet port communicating with the upper portion of the larger bore in each cylinder, a duct lea-ding from the upper portion of the larger bore in each cylinder to the pocket at the head end of the other cylinder mechanically actuated valves normally closing all of said ports, and means including cams mounted directly on the crank shaft of the engine for unseating all of said valves.

3. In an internal combustion engine, a pair of cylinders, each having a two diameter bore, the head portion of the smaller bore of each cylinder having a lateral pocket, a pair of ports in each pocket, a gaseous fuel inlet port communicating with the upper portion of the larger borel in each cylinder, a two diameter piston arranged for operation within each cylinder mechanically actuated valves normally closing all of said ports, and means including cams mounted directly on the crank shaft of the engine for unseating all of said valves.

4. In an internal combustion engine, a pair of cylinders, each having a two diameter bore, the head portion of the smaller bore of eachcylinder having a lateral pock- CII et', a pair et' ports in each pocket, a gaseous fuel inlet port con'iunicating with the upper portion oi" the larger bore in each cylind r, a two dian'ieter piston arranged for operation with-iin each cylinder, a crank shaft having two cranks to which the two pistons are re.- spectively connected mechanically actuated Valves normally closing all of said ports, and means including cains mounted directly on the crawl; shaft of the engine jl'or` nnsezrting all of said valves.

5. In an :internal combustion engine, a pair o* cylinders, eachA having a two di'aineter here, the head portion of the smaller bore ol each. cylinder lnwing a lateral poel;n et, a pair `Ol1 ports in each pocket, a' gaseous 'fuel inlet portel communicating with the upper portion oit the lnrger bore in each cylinder, a duct leading lroin the upper portion o'lithe larger here in each cylinder to the pocket at the' head end of the' other cylinder, a two diameter piston arranged for operation within each cylinder mechair ical'ly actuated valres norinally closing all of said ports, and n'ieans ineluning cams mounted directly on the crank shal't of the engine for nnseatin'g all of said valres.

6. ln anii'iternal conilnistion engine, a pair olf cylinders7 each haring a two diameter here, the head portion' oit the. smaller bore oit ench cylinder having a lateral poele et, a pair o' ports in each pocket, one Yliuel inlet port communicating with the upper portion et the larger here in each cylinder, a duct leading from the upper portion of the larger bore in each cylinder to the pocket at the head endA of the other cylinder,A a two diineter piston arranged l'or operation within each cylinder, a crank shaft having twoA cranks to which the vtwo pistons are respectively connected Amechanically actuated valves normally closing all of said ports, and means including cams mounted on said crankshaft for unseating all of said valves. y

7. An internal combustion engine having a pair or cylinders disposed' in vlLarrnngement, each cylinder having a' two di'- ameter bore, a pocket extending laterally 'from the head end oli the sinaller chai'i'il'ier in each cylinder, each pocfirct haring a pair ot porte, a duct leading Alroin the chamber of larger d meter in cach cylinder to the pocket ot the other c rliiulcr, gaseonn l'uel inlet duct leading into the larger cliainlier in cach cylinder mechanically actuaire! valves normally closing all olf said ports, and inc/ans` including earns mounted directly on the crank shalt of the engine tor nnseating all ol said Valves,

8. jin internal combustion engine having a pair of cylinders disporzcd in Vaubrnngenient, each cylinder haring a two diameter here, a poclcet extending laterally iiroin the head end et the smaller chamber in each cylinder, each pocket having` a pair ol ports, a duct leading lroni the chamber of l erger diameter in each cylinder to the pocl-- et ot the other cylinderJ a gaseous ilfuel inict duct leading into the larger chaniher in each cyluider, a two diameter piston arranged 'lor operation within cach cylinder i dianically -aciuated ralrcn c @sing all ot' said ports, and ineann includine canas mounted directly on the crank sli lit et the engine 'for nnreating all of said valves.

9. jin internal con'iliuetioi'i engine having a pair ot cylinders dispof-ied in V-arrangenient, each cylinder having a two diameter here, a poclriet extending laterally iroin the head end ot the smaller chaniler in cach cylinder, each pocket having a pair o lf' ports, a duct leading ili'roni the chainhcr ot larger diameter in each cylinder to the pocket ol the other cylinder, a gaseous :l'uel` inlet duct lead" into the larger clnunlier .in each cylinder, a two diameter piston. arranged itor operation within each cjyflindcr, a crank sha'l't having two cranks to which said pistons are respectively connected incchanically actuated valvee4 ncnmally closfzing all olf said ports, and means including carne mounted directly on the crank shat't oit the engine for unseating all of said valves.

InA testimony whereof l. ailin my signature.

norina l ln till 

